<template>
	<view>
    <view class="search-box">    
    <my-search @click="gotoSearch"></my-search>
    </view>
    <view class="scroll-view-container">
  <scroll-view scroll-y="true"  class="lefe-scroll-view" :style="{height: windowHeight+'px'}">
    <block>
      <view  class="left-scroll-view-item" :class="{active : index === active? 'active':''}" v-for="(item,index) in cateList" :key="index" @click="activeChange(index)">{{item.cat_name}}</view>
    </block>
  </scroll-view>
      <scroll-view scroll-y="true"  class="right-scroll-view" :style="{height: windowHeight+'px'}" :scroll-top="scrollTop">
       <view class="cate-lv2-title" v-for="(item2,index2) in cateleavel2" :key="index2">/ {{item2.cat_name}} /
        <view class="cate-lv3-list">
          <view class="cate-lv3-item" v-for="(item3,index3) in item2.children" :key="index3" @click="gotoGoodlist(item3)">
            <image :src="item3.cat_icon" mode=""></image>
            <text>{{item3.cat_name}}</text>
          </view>
        </view></view>
      </scroll-view>
    </view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				windowHeight: 0,
         cateList: [],
         active : 0,
         cateleavel2:[],
         scrollTop: 0
			};
		},
    onLoad() {
      let info = uni.getSystemInfoSync()
      this.windowHeight = info.windowHeight-50
        this.getCateList()
    },
    methods:{
      gotoSearch(){
       uni.navigateTo({
         url:'/subpkg/search/search'
       })
      },
      gotoGoodlist(item3){
        uni.navigateTo({
          url: '/subpkg/good_list/good_list?cid='+item3.cat_id
        })
      },
      activeChange(index){
        
        this.active = index
        this.cateleavel2 = this.cateList[index].children
        this.scrollTop =  this.scrollTop === 0 ? 1 : 0
      },
      async getCateList() {
        const { data: res } = await uni.$http.get('/api/public/v1/categories')
        // 请求失败
        if (res.meta.status !== 200) return uni.$showMsg()
        this.cateList = res.message
        this.cateleavel2 = this.cateList[0].children
      },
    }
	}
</script>00b 

<style lang="scss">
 .search-box{
   position: sticky;
   top: 0;
   z-index: 999;
 }
.scroll-view-container{
  display: flex;
  .lefe-scroll-view{
    width: 240rpx;
  }
}
.left-scroll-view-item{
   line-height: 60px;
    background-color: #f7f7f7;
    text-align: center;
    font-size: 12px;
    &.active {
      background-color: #ffffff;
      position: relative;
      // 渲染激活项左侧的红色指示边线
      &::before {
        content: ' ';
        display: block;
        width: 3px;
        height: 30px;
        background-color: #c00000;
        position: absolute;
        left: 0;
        top: 50%;
        transform: translateY(-50%);
      }
    }
}
.cate-lv2-title{
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list {
  display: flex;
  flex-wrap: wrap;
  .cate-lv3-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 33.33%;
    margin-bottom: 10px;
    image {
      width: 60px;
      height: 60px;
    }
    text {
      font-size: 12px;
      font-weight:normal
    }
  }
}
</style>
